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Example using Interface in Java

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import java.util.*;
interface Num{
int a=5, b=10;
} // All identifiers declared within an interface are final

public class Add implements Num{
 public Add(){
 int add=a+b;
System.out.println("Sum: "+add);
}
public static void main(String[] args){
Add ad=new Add();
}
} 


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